Warsow is a barebones Unreal Tournament or Quake 3 fast action shooter (and available for free on GoG). Bots are available. Graphics are fairly sparse. I’m not big into FPS, but the action was entertaining enough.
Warsow seems designed for E-Sports (I know, I know…). There seems to be many options in viewing games, TV (?), and so on.
I don’t think Warsow would replace Quake 3 or Unreal Tournament if you like fast paced arena shooters, but it is seems good for being free. At least it isn’t another point and click adventure game.
What I wouldn’t give for a game like Subspace/Continuum made for today.